Investigation of Gully Erosion Using Integrated Electrical Resistivity Methods in Parts of Enugu North Zone, Southeastern Nigeria

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Abstract Geophysical study of gully erosion was carried out in parts of Enugu North zone, Southeastern Nigeria, using integrated electrical resistivity method. Thirty five VES points were carried out along gully erosion sites using the Schlumberger configuration with maximum spread of 400m, and eight ERT points using Wenner electrode configuration with maximum spread of 200m. Low resistivity indicating loosed soil materials were observed. High resistivity values showing silt, clay and bedrock were estimated. The 2D ERT inversion result indicate three subsurface zones; loosed soil layer dominated with sandy soil, diffused soil layer suspected to be sandy clay and compacted layer attributed to dry clay or bedrock. The hydraulic conductivity values for the first and second layer, ranged from 0.303m/day to 27.7m/day and 0.093m/day to 153m/day respectively, indicating that the measure of the ability of water to flow through the soil is very high and this makes the area susceptible to erosion. First and second layers porosity values include; 20.1–40.4% and 14.8–48.1% respectively. The porosity result indicates that the amounts of pores or open space between the soil particles is very high and therefore, contribute majorly to the factor influencing the rate of gully erosion in the area.

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